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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1512f8b9c0a43e44b8ff25ded22e2bad3bcc7a67d6a33016582f2aa4fbd41514' 
  AND token = 'VP/PMgjOgW/fb285ndv5ir69tApUkYx1IiMhCtNNWwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}